<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Array 1</title>
</head>
<body>
    

</body>
</html>
    <script>
        let arr1 = ['张三','赵六','王五','李四'];
        let arr2 = ['100','200','300','400'];
        let arr3 = [1,2,3]
        let arr4 = arr1.concat(arr2,arr3);
        document.write(arr4);
        
    </script>